1. MODERN CHEMISTRY CHAPTER 14 ACIDS AND BASES
Sections 1 -3
Properties of Acids & Bases
Acid-Base Theories Acid-Base Reactions
Chapter 14 Section 2 Acid-Base Theories p

2. Chapter 14 Section 2 Acid-Base Theories p. 478-482
Brønsted - Lowry
Lewis
Chapter 14 Section 2 Acid-Base Theories p

3. Brønsted-Lowry Acid & Base
NH3(aq) + H2O(l) 
NH4+(aq) + OH-(aq) + H O N
OH- H N H H H H H H H
A molecule or ion that is a proton acceptor BASE
A molecule or ion that is a proton donor ACID
Chapter 14 Section 2 Acid-Base Theories p

4. Bronsted-Lowry Acid & Base
Chapter 14 Section 2 Acid-Base Theories p
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5. Chapter 14 Section 2 Acid-Base Theories p. 478-482
Monoprotic Acid
Acids that can donate only one proton per molecule
Examples: HCl, HNO3, HF, HClO3
Organic acids are all monoprotic.
Only the acidic hydrogen is donated.
Chapter 14 Section 2 Acid-Base Theories p

6. Monoprotic & Polyprotic
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7. Chapter 14 Section 2 Acid-Base Theories p. 478-482
Polyprotic Acids
Acids that can donate more than one proton per molecule.
H2SO4 is diprotic. H3PO4 is triprotic.
Sulfuric acid dissociates in steps.
H2SO4 + H2O  H3O+ + HSO4-
HSO4- + H2O  H3O+ + SO42-
Chapter 14 Section 2 Acid-Base Theories p

8. Chapter 14 Section 2 Acid-Base Theories p. 478-482
Lewis Acids & Bases
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9. Chapter 14 Section 2 Acid-Base Theories p. 478-482
Lewis Acid
An atom, ion or molecule that accepts an electron pair to form a covalent bond H+ +
:NH3 
H : NH3
{or NH4+}
Lewis Acid
Chapter 14 Section 2 Acid-Base Theories p

10. Chapter 14 Section 2 Acid-Base Theories p. 478-482
Lewis Base
An atom, ion or molecule that donates an electron pair to form a covalent bond :B
: : F :B
: : F
:F:1-
: : +  :F
Lewis Base
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11. Comparing Definitions
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12. Chapter 14 Section 2 Acid-Base Theories p. 478-482
Ch 14 Sec 2 Homework
Page 482 # 1-3
Chapter 14 Section 2 Acid-Base Theories p